Apparatus for heating liquids, especially milk.



J. FLIEGEL. APPARATUS FOR HEATING LIQUIDS, ESPECIALLY MILK APPLICATION FILED NOV. 9, 1909.

987,975, Patented Mar. 28, 1911.

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Josnr :FLIEGEL, on MALLMITZ, GERMANY, AssIGN MALLMITZL GERMANY.

' APPARATUS Fofarrnarmo LIQUIDS, ESPECIALLY MILK.

' -Toidll whom it may concern: a a

Be it known that I, J osnr Funcnn, sub- I ject of theGerman Emperor, residing at Mallmitz', Germany, have invented new and useful, Improvements in Apparatus for Heating Liquids, Especially Milk, of which the following is a specification.

This invention relates to an a paratus for heating liquids, especially milk, wherein the milk flowing down a helical-shaped heat: ing body is subjected to the action of a heating medium flowing in an opposite direction.

The invention is based on the principle of heating by means of a water-bath heated by steam and has for its object to solve the problem' of effecting the heating of the5 highly sensitive milk (to pasteurizing teni-j perature) without agitator, the burning-of the milk being prevented and also the-admission of steam into the water. The steam remains apart and isvprevenft-ed from directly heating the metal surface along which the milk trickles. Thus the steam merely heats the surrounding water. This Water, however, is heated only in such a manner that it must circulatein itself and while rising in an opposite direction to the flow of the milk, it must deliver its heat to the latter, so that when in a boiling state, it can never exchange heat with the fresh incoming milk but always only at a temperature below 100 centigr'ade. 'In this manner, exactly the same favorable conditions exist as when boiling the milk in the water bath. The said conditions are complied with by the hereinafter described apparatus, which is mainly constructed in such a manner that a steam pipe is provided in the chamber at the lower part of a partition or casing, said chamber being filled with water and situated between the helical-shaped heating body and .the outer wall, whereby the water, While being heated, moves constantly in an upward direction, v r

Referring to the accompanying drawing, Figure l is a vertical section through the heater and Fig. 2 is a plan thereof.

10 is the outer casing, whichsurrounds the various sections or compartments of the apparatus. The milk flows through the in let 1 into -the interior of the ribbed casin 2 in order to trickle along the helical-shaped path, which is formed 'by the attachmefi'tfi'f extending to the ribs of the casing 2. 'Whefi the milk has reached the bottom of the} closed above so .that'a certain heat parat'us at 13.

s ecification 0: Letters Patent. P te t d M 23, 1911 Application filed November 9, 1909. Serial No. 522,078.

ribbed body 2, it flows through the lower lnlet 5- of the attachment 3, rises therein in order to flow overthe upper edge of the vessel into the latter and then through the pipe 7 ,toward theoutlet 9, whereupon it passes the thermometer 8. The vessel 3 is is stored up therein andaIso in the vessel 6.

The milk fwhile flowing along the helicalshap'ed path' 'formed between the casings 2 and 3 'is solely heated by hot water.; This water: is contained inthe chamber, which is formed-by: thecasings 2 and 10. The chamber contains a helical pipe 11, in which steam enters -at-1,2, which delivers its heat to the surrounding water'and leaves the ap- The heated rising water delivers the heatimparted to it immediately to the ribbed heating body 2. In order to extend the path of the "rising water and to cause an intimate feed of the heated layers thereof into the helical-shaped chamber between the ribs of the heating body 2, the easing 1 1 is provided, which possesses internally a helical-shaped rib 19 made of sheet metal. These ribs compel the hot water to enter between the ribs of the casing 2. The

casing l lhas moreover the function to promote the circulation of the water, in that the water,,whi'ch becomes cooler above, is conducted below, where it is re-heated' The effeet is also attained that above, at the point where the milk enters the ribbed body 2, the

water is cooled to such an extent in consequence of the delivery of heat to the ribbed body that any formation of steam and any burning of the milk is prevented, whereas the heatof the water toward the bottom increases to the extent required for heating. the milk. I: 3

4 In consequence of the heating of the water by steam and that of the milk by the heated water, athoroughheating of the milk is effected as, in any boiler standing in the waterbath, and a burning of the milk is prevented owing to-the previously mentioned cooling ofthe upper layers of water. The hygienic requirement is also complied withi according to which the milk shall be heate to a temperature not exceeding :70? centigrade and this temperature maintained for at least 5 minutes. For this purpose, the apparatus is (if such diameter and height that it is adaptreceive in the interior of the casing 3 vmuch milk as is permissible in five minutes by the eiiiciency of the apparatus with respect to the sectional area of the-helical path in the ribbed body 2. Thus, at least 5 minutes must elapse, before the milk, which enters below at 5 into the. collecting chamber, canpass out at 9.

15 is a safety valve, which is so adjusted that it blows off even at low steam pressure, whereby the attendant is made aware of the fact that less steam must be introduced.

' 16is a water-gage cock, above which the surface of the water should not .rise before the apparatus is rendered operative. In consequence of its own expansion due to the influence of'heating, the water then rises of itself in order to fill up the chamber above the cock. 1

17 is a ventilating pipe, which is necessary, because otherwise air would collect at the side opposite tothe inlet 1, and become compressed, thereby afi'ecting the uniform flow of themilk. In the. absence of the pipe 17, hollow spaces would be formed. in the helical path of the casing 2 and 3, which would lead to a drying of the remainder of the milk and to interruptions in wOrking.

Correction in Letters Patent No. 987,975.

By the provision of the central cylinders 6, which are also heated in consequence of the temperature prevailingin the interior ofthe casing 3, the effect is attained that on the one hand, the path along which the milk has to travel, is correspondingly ex- In liquid heating apparatus, in combina tion, a helical shaped conduit through which the liquid to be heated is conveyed, said conduit being provided with an inlet at its upper .end and an outlet at its lower end, an

outer wall surrounding said conduit and forming a ichamberadapted to'contain the heating medium, apipe within said chamher at the lower portion thereof andwhich is adaptedto be connected to the source of supply ofthe heated medium, and a artition within said chamber between sai oon-.

duit and said outer wall, said pipe being positioned between said partition and said conduit whereby the-heated medium contained within the portion of the chamber between the.conduit and the partitionwill be caused to move in an. upward direction;

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

Y J OSEF .FLIEGEL.

Witnesses: y

WOLDEMAR HAUPT, HENRY HASPER.

It is hereby certified that in Letters Patent No. 987,975, granted March-28, 1911, I upon the application of osef Fliegel, of Mallmitz, Germany, for an improvement in Apparatus for Heating Liquids, Especially Milk, an error appears requiring correction as follows: In the grant and in the printed heading the name of, the asslgnee is erroneously written and printed Georg Lindermann whereas said I name should have been written and printed Georg Sz'izdermann; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office. I

Signed and sealed this 6th day of June, A. D., 1911.

o. c. BILLINGS, I

Acting Commissioner of Patents,

minutes by the eiiiciency of the apparatus with respect to the sectional area of the-helical path in the ribbed body 2. Thus, at least 5 minutes must elapse, before the milk, which enters below at 5 into the. collecting chamber, canpass out at 9.

15 is a safety valve, which is so adjusted that it blows off even at low steam pressure, whereby the attendant is made aware of the fact that less steam must be introduced.

' 16is a water-gage cock, above which the surface of the water should not .rise before the apparatus is rendered operative. In consequence of its own expansion due to the influence of'heating, the water then rises of itself in order to fill up the chamber above the cock. 1

17 is a ventilating pipe, which is necessary, because otherwise air would collect at the side opposite tothe inlet 1, and become compressed, thereby afi'ecting the uniform flow of themilk. In the. absence of the pipe 17, hollow spaces would be formed. in the helical path of the casing 2 and 3, which would lead to a drying of the remainder of the milk and to interruptions in wOrking.

Correction in Letters Patent No. 987,975.

By the provision of the central cylinders 6, which are also heated in consequence of the temperature prevailingin the interior ofthe casing 3, the effect is attained that on the one hand, the path along which the milk has to travel, is correspondingly ex- In liquid heating apparatus, in combina tion, a helical shaped conduit through which the liquid to be heated is conveyed, said conduit being provided with an inlet at its upper .end and an outlet at its lower end, an

outer wall surrounding said conduit and forming a ichamberadapted to'contain the heating medium, apipe within said chamher at the lower portion thereof andwhich is adaptedto be connected to the source of supply ofthe heated medium, and a artition within said chamber between sai oon-.

duit and said outer wall, said pipe being positioned between said partition and said conduit whereby the-heated medium contained within the portion of the chamber between the.conduit and the partitionwill be caused to move in an. upward direction;

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

Y J OSEF .FLIEGEL.

Witnesses: y

WOLDEMAR HAUPT, HENRY HASPER.

It is hereby certified that in Letters Patent No. 987,975, granted March-28, 1911, I upon the application of osef Fliegel, of Mallmitz, Germany, for an improvement in Apparatus for Heating Liquids, Especially Milk, an error appears requiring correction as follows: In the grant and in the printed heading the name of, the asslgnee is erroneously written and printed Georg Lindermann whereas said I name should have been written and printed Georg Sz'izdermann; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office. I

Signed and sealed this 6th day of June, A. D., 1911.

o. c. BILLINGS, I

Acting Commissioner of Patents,

It is hereby certified that in Letters Patent No. 987,975, granted March 28, 1911, upon the application of Josef Fliegel, of Mallrnitz, Germany, for an improvement in Apparatus for Heating Liquids, Especially Milk, an error appears requiring correction as follows: In the grant and in the printed heading the name of the assignee is erroneously written and printed Georg Lindermann Whereas said name should have been written and printed Georg Sindermann; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Oflice.

Signed and sealed this 6th day of June, A. D., 1911.

[SEAL] C. C. BILLINGS,

Acting Commissioner of Patents. 

